Dodge Caliber. Manual — part 448
B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
8O - 189
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
While the CAN bus ignition status is in IGN_RUN, the module checks the sensor input ranges.
•
Set Condition:
If the module detects that the sensor input is less than 3.4 ± 0.6% of the (R701) Seat Weight Sensor 5 Volt
circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5 Volt circuit is shorted to ground.
However, this condition would prevent communication with the OCM and cause a Lost Communication With
OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no
longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key
will change the status from active to stored if the condition that set the fault is no longer present.
Possible Causes
ACTIVE B1B88 DTC AND B1B89 DTC AT THE SAME TIME
PASSENGER SEAT HARNESS IMPROPERLY ROUTED
PASSENGER SEAT HARNESS WIRES CHAFED, PIERCED, PINCHED, PARTIALLY BROKEN
PASSENGER SEAT HARNESS CONNECTOR TERMINALS BROKEN, BENT PUSHED OUT, SPREAD,
CORRODED, CONTAMINATED
(R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT OPEN
(R701) SEAT WEIGHT SENSOR 5 VOLT CIRCUIT OPEN
RIGHT-REAR SEAT WEIGHT SENSOR
OCCUPANT CLASSIFICATION MODULE (OCM)
Diagnostic Test
1.
CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT
CLASSIFICATION MODULE (OCM)
NOTE: Ensure that the battery is fully charged.
Turn the ignition on, then off, and then on again.
With the scan tool, read Occupant Classification Module (OCM) DTCs.
Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?
Yes
>> Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of
symptoms.
No
>> Go To 2
2.
VERIFY THAT DTC B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW
IS ACTIVE
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT
CIRCUIT LOW?
Yes
>> Go To 3
No
>> Go To 10
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
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3.
VERIFY THAT DTC B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW
AND B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH ARE ACTIVE
AT THE SAME TIME
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1B88-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT
CIRCUIT LOW DTC AND B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT
HIGH DTC AT THE SAME TIME?
Yes
>> Perform B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH.
No
>> Go To 4
4.
INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS
WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look
for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contam-
inated terminals.
Are any of these conditions present?
Yes
>>
NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or
testing for is present in the Seat Harness.
Replace the Passenger Seat Harness in accordance with the Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY
Verify that the Passenger Seat Harness is routed correctly.
Is the Passenger Seat Harness routed correctly?
Yes
>> Go To 6
No
>> Reroute the Passenger Seat Harness as necessary.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
6.
CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5 VOLT CIRCUIT
Disconnect the Right-Rear Seat Weight Sensor connector.
WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.
Measure the voltage of the (R701) Seat Weight Sensor 5 Volt circuit.
Is the voltage above 4.8 volts?
Yes
>> Go To 7
No
>> Go To 9
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
8O - 191
7.
CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
WARNING: To avoid personal injury or death, turn the ignition off,
disconnect the battery and wait two minutes before proceeding.
Disconnect the OCM C2 connector.
Measure the resistance of the (R706) RT-RR Seat Weight Sensor Signal
circuit between ground and the OCM C2 connector.
Is the resistance below 10k ohms?
Yes
>>
NOTE: Do not attempt to repair the Seat Harness. Replace the Seat
Harness if the condition inspecting or testing for is present in the
Seat Harness.
Replace the Passenger Seat Harness in accordance with the
Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
No
>> Go To 8
8.
CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN
Measure the resistance of the (R706) RT-RR Seat Weight Sensor Signal circuit between the OCM C2 connector
and the Right-Rear Seat Weight Sensor connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Right-Rear Seat Weight Sensor in accordance with the Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. If DTC B1B88–PASSENGER SEAT WEIGHT
SENSOR 1 - RIGHT REAR INPUT CIRCUIT LOW returns active, replace the OCM in accordance with
the Service Information.
No
>>
NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or
testing for is present in the Seat Harness.
Replace the Passenger Seat Harness in accordance with the Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
9.
CHECK (R701) SEAT WEIGHT SENSOR 5 VOLT CIRCUIT FOR AN OPEN
WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two min-
utes before proceeding.
Disconnect the OCM C2 connector.
Measure the resistance of the (R701) Seat Weight Sensor 5 Volt circuit between the OCM C2 connector and the
Right-Rear Seat Weight Sensor connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the OCM in accordance with the Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
No
>>
NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or
testing for is present in the Seat Harness.
Replace the Passenger Seat Harness in accordance with the Service Information.
Perform OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.
Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1.
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
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